CPT code 80171: Gabapentin level, quantitative drug level2026 Medicare lab fee · Clinical Laboratory Fee Schedule
A quantitative gabapentin test measures the drug concentration in whole blood, serum, or plasma when a clinician needs a gabapentin level.
Medicare pays $21.67 for 80171 under the 2026 Clinical Laboratory Fee Schedule: one national amount, the same in every state and setting.
Medicare lab fee · CLFS 2026 Q4
National CLFS amount
$21.67
In effect since Jan 1, 2026. The same amount in every state, payment locality and setting.
- Geographic adjustment
- None
- Office vs facility
- Same
- Since 2020
- Unchanged
- CMS updates
- Quarterly
Medicare pays the lesser of the lab’s charge and this amount. Patients usually owe no Part B deductible or coinsurance for covered clinical lab tests.
On this page 7 sections
What 80171 covers
Code 80171 identifies a quantitative laboratory measurement of gabapentin concentration. The test may use whole blood, serum, or plasma. It is used during gabapentin treatment when a clinician needs a measured drug level; a clinical laboratory performs the measurement and reports the result for clinical interpretation. It measures gabapentin specifically, rather than screening for multiple drug classes or measuring another medication.
Medicare pays the test under the CLFS at one nationally set amount that is the same across localities and office and facility settings. The 2026 national amount is $21.67, unchanged from 2020 through 2026. The code is excluded from the physician fee schedule and is paid only through the CLFS. Report it when the quantitative gabapentin measurement is performed; the specimen options do not change the analyte measured.
This summary was written with AI assistance from CMS Clinical Laboratory Fee Schedule data. Amounts on this page come directly from CMS files.
How Medicare pays 80171
Clinical lab tests aren’t priced like physician services. They’re paid from their own fee schedule, with its own rules. See the whole lab fee schedule.
One national amount
CMS sets a single Clinical Laboratory Fee Schedule amount for 80171. There’s no geographic (GPCI) adjustment, so it pays the same in every state and payment locality.
No office or facility rate
Lab tests aren’t built from relative value units, so there’s no office and facility split: the place of service doesn’t change the CLFS amount.
Updated every quarter
CMS republishes the CLFS each quarter. New tests, often proprietary laboratory analyses (PLA codes), join during the year; existing amounts are updated each January.
Excluded from the physician fee schedule
The physician fee schedule lists 80171 with status X (excluded by statute), so the test itself is paid only from the CLFS.
80171 on the lab fee schedule since 2020
80171 · CLFS 2026 Q4 (current)
$21.67
Unchanged since Jan 1, 2020
27 quarterly CLFS releases on file, first CLFS 2020 Q1. A code missing from a quarter wasn’t on that release.
80171 compared with similar tests
- 80175Lamotrigine levelQuantitative drug assay$13.25
- 80171 measures gabapentin; 80175 measures lamotrigine. Select the code for the medication measured.
- 80177Levetiracetam levelQuantitative concentration$13.25
- 80171 measures gabapentin, while 80177 measures levetiracetam.
- 80185Phenytoin levelTotal drug concentration$13.25
- 80171 measures gabapentin; 80185 measures total phenytoin.
80171 billing questions
Which specimens can be tested?
The quantitative gabapentin measurement may use whole blood, serum, or plasma.
Does 80171 screen for multiple drug classes?
No. It identifies a quantitative measurement of gabapentin, rather than a broad screen for multiple drug classes.
How does 80171 differ from 80175 or 80177?
80171 measures gabapentin; 80175 measures lamotrigine, and 80177 measures levetiracetam. The reported code follows the medication measured.
How does Medicare pay for this test?
Medicare pays 80171 through the CLFS at one national amount, without geographic or office-versus-facility adjustment.
Is 80171 paid under the physician fee schedule?
No. Medicare pays this test only through the CLFS; it is excluded from the physician fee schedule.
Where this amount comes from
FeeBase reads lab amounts directly from the CMS Clinical Laboratory Fee Schedule file for the quarter: one row per code, with its payment indicator and national amount. Contractor-priced tests are labeled, never given a made-up amount. Amounts are Medicare payment limits, not a patient’s bill or a commercial rate.
CMS CLFS 2026 Q4 · effective Oct 1, 2026 through the day before Jan 1, 2027
Show the CMS file line behind this amount
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